fix schema dump ignoring indexes with multi-column expressions

Author: ezekg

lib/clickhouse-activerecord/schema_dumper.rb

@@ -99,7 +99,7 @@ def table(table, stream)
             end
           end
 
-          indexes = sql.scan(/INDEX \S+ \S+ TYPE .*? GRANULARITY \d+/)
+          indexes = sql.scan(/INDEX \S+ .+? TYPE .*? GRANULARITY \d+/)
           if indexes.any?
             tbl.puts ''
             indexes.flatten.map!(&:strip).each do |index|

spec/fixtures/migrations/dsl_create_table_with_index/4_create_simple_index.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class CreateSimpleIndex < ActiveRecord::Migration[7.1]
+  def up
+    add_index :some, 'date', name: 'idx4', type: 'minmax', granularity: 1
+  end
+end

spec/single/migration_spec.rb

@@ -311,6 +311,48 @@
 
             ActiveRecord::Base.connection.clear_index('some', 'idx2')
           end
+
+          it 'schema dumps and restores column indexes' do
+            require 'clickhouse-activerecord/schema_dumper'
+
+            quietly { migration_context.up(4) }
+
+            current_schema = StringIO.new
+            ClickhouseActiverecord::SchemaDumper.dump(ActiveRecord::Base.connection, current_schema)
+
+            ActiveRecord::Base.connection.drop_table('some', sync: true)
+            quietly { eval(current_schema.string) }
+
+            expect(ActiveRecord::Base.connection.show_create_table('some')).to include('INDEX idx4 date TYPE minmax GRANULARITY 1')
+          end
+
+          it 'schema dumps and restores multi-column indexes' do
+            require 'clickhouse-activerecord/schema_dumper'
+
+            quietly { migration_context.up(1) }
+
+            current_schema = StringIO.new
+            ClickhouseActiverecord::SchemaDumper.dump(ActiveRecord::Base.connection, current_schema)
+
+            ActiveRecord::Base.connection.drop_table('some', sync: true)
+            quietly { eval(current_schema.string) }
+
+            expect(ActiveRecord::Base.connection.show_create_table('some')).to include('INDEX idx (int1 * int2, date) TYPE minmax GRANULARITY 3')
+          end
+
+          it 'schema dumps and restores expression indexes' do
+            require 'clickhouse-activerecord/schema_dumper'
+
+            quietly { migration_context.up(3) }
+
+            current_schema = StringIO.new
+            ClickhouseActiverecord::SchemaDumper.dump(ActiveRecord::Base.connection, current_schema)
+
+            ActiveRecord::Base.connection.drop_table('some', sync: true)
+            quietly { eval(current_schema.string) }
+
+            expect(ActiveRecord::Base.connection.show_create_table('some')).to include('INDEX idx2 int1 * int2 TYPE set(10) GRANULARITY 4')
+          end
         end
       end
     end